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-rw-r--r--Documentation/SECURITY.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/SECURITY.md b/Documentation/SECURITY.md
index e9e1015..003eadb 100644
--- a/Documentation/SECURITY.md
+++ b/Documentation/SECURITY.md
@@ -37,6 +37,8 @@ File Names
Every directory gets a 128-bit directory IV that is stored in each
directory as `gocryptfs.diriv`.
-File names are encrypted using AES-256-CBC with the directory IV.
+File names are encrypted using AES-256-CBC with the directory IV as
+initialization vector. The Base64 encoding limits the usable filename length
+to 176 characters.
![](https://rawgit.com/rfjakob/gocryptfs/master/Documentation/file-name-encryption.svg)